Repeater fuse



Dec. 9, 1958 GREBER 7 2,863,966

REPEATER FUSE Filed July 16, 1956 FIGS INVENTOR.

United States Patent REPEATER FUSE Henry Greber, New York, N. Y.Application July 16, 1956, Serial No. 597,936

7 Claims. (Cl. 200-124) The purpose of this is to provide a repeaterfuse which can be used repeatedly to interrupt overcurrents. For thisaim a fusible element made of metal of low melting point, such as tin orWoods metal, is placed on the upper part, inside a horizontal insulatingtube. At overcurrent the fusible metal melts, pours down, and solidifieson the lower part of the inside wall of the tube. By turning the tube by180 the solidified fusible metal comes in its original position and canbe used again for overcurrent protection.

On the accompanying drawing, Fig. 1 shows a cross section of the fuseand Fig. 2, a cross section of the jaw contact. Fig. 3 indicates anapplication of the fuse for lighting panels, and Fig. 4 exemplifies adesign of a repeater fuse with automatic reclosing.

The fuse, shown on Fig. 1, consists of an insulating tube 1, containingthe fuse element 2. The ferrule 3 is placed on one end of the tube,whose other end is provided with two half-ferrules 4 and 5, which areseparated by an insulating plate 6. The cross section of the ferrule 3is preferably elliptical. Fig. 2 shows a jaw contact of half-ferrules 4and 5, which snap into contacts 7 and 8. Whereas contact 7 is metallic,its counterpart 8 is made of insulating material. The jaw holdingferrule 3 is of customary design and consists of two metallic contactssuch as 7 on Fig. 2. Fig. 3 shows an application of the above describedfuse for lighting panels.

It consists of an insulating tube 9, which is fastened to a knob 10, bywhich the tube 9 with its ferrules 11, 12, 13 can be turned in the jaws14 and 15. Fig. 4 shows the application of the fuse for remote orautomatic reclosure. The insulating tube 16, provided with its ferrules16, 17, 18 is placed in the jaw contacts 19, 20. Tube 17 carries aratchet wheel 21 and a loose ratchet arm 22, and ratchet 25 connected bya linkage 23 with the core of the electromagnet 24.

In operation of the fuse in case of overcurrent the fusible element 1,on Fig. l, flows down, disconnects ferrules 3 and 4 and connectsferrules 3 and 5. In order to bring the fuse in operational positionagain 2,863,966 Patented Dec. 9, 1958 it has to be turned by around itshorizontal axis. This can be done manually, by means of a knob 10 onFig. 3, or by means of an electromagnet 24 on Fig. 4. In the latter casewhen the electromagnet is energized it turns by 180 the insulating tube16, through ratchet 22, ratchet wheel 21 and linkage 23. The saidelectromagnet can be energized by means of a remote push button stationor by a reclosing clock mechanism.

The shown embodiments of this invention are illustrative only. It is tobe understood that many varia tions and modifications can be madewithout departure from the spirit of this invention and within the scopeof the appended claims.

I claim:

1. Repeater fuse with horizontally mounted tube having one contact inform of a ferrule on one of its ends, and on its opposite end twocontacts in form of halfferrules being insulated one from the other toprovide separate contact areas, said tube being turnable around itslongitudinal axis in fuse holder jaws, said ferrule being connected toany one of the two half-ferrules by means of a fusible link of metal.

2. Repeater fuse with horizontally mounted tube as in claim 1, said tubebeing rotatable in its contact jaws by means of an electromagnet whichcan be energized remotely.

3. Repeater fuse with horizontally mounted tube as in claim 1, said tubebeing rotatable in its contact jaws by means of an electric motor.

4. Repeater fuse as in claim 2, with said electromagnet being energizedby a timing relay operating after the fuse has opened the circuitprotected by it.

5. Repeater fuse as in claim 3, with said motor being energized by atiming relay after the fuse has opened the circuit protected by it.

6. A repeater fuse as in claim 1 with said fuse holder having two pairsof jaws one pair being of metal, the other pair of jaws consisting ofone metallic contact and one of insulating material.

7.A repeater fuse as in claim 1 turnable around its horizontal axis bymanual operation of an insulating knob directly attached to said tube.

References Cited in the file of this patent UNITED STATES PATENTS948,704 Nagel Feb. 8, 1910 1,386,525 Oca-Balda et a1. Aug. 2, 19211,416,258 Brooks May 16, 1922 FOREIGN PATENTS 53,236 Denmark June 21,1937 147,929 Switzerland Sept. 16, 1931 637,961 Great Britain May 31,1950

